x的4倍减去5等于15，列出的方程是4x－5=15．

“诸子百家论社会变革，百家争鸣现思想博弈”此种情形出现的原因不包括（    ）

根据所给的语境和首字母的提示，补充完整下面的对话。

Nina: Can you d____sports with me this weekend, Andy?

 Andy: Sorry, I can't.

Nina: W____will you do this weekend?

Andy: I don’t know. My mom a____ comes home from work so tired. I w____to help her around the house. What chores can I do around the house for my mom?

Nana: Try this... make a list of (一列表) the chores your mom has to do when she comes home from work.

Andy: OK. She has to m____the bed. I will do it. She has to cook. I c____cook, but I will help her by washing the vegetables. She has to d____the dishes. She has to c____the floor, dust the furniture and w____the dog. I can do all of them.

Nana: You d____have to do all of the chores. You may help your mom by keeping your bedroom clean and tidy. 

Andy: I see.